A British study conducted by trade-in monitoring company CompareMyMoble, and shared by Phone Arena, reveals that Apple’s iPhone 6 and iPhone 6 Plus are the most valuable devices of 2014, followed distantly by Samsung phones such as the Galaxy S5 and Galaxy Note 3. FROM EARLIER: Tim Cook confirms that the iPhone 6 is a nightmare for Android The peak trade-in price for the iPhone 6 and/or iPhone 6 …